The factory bluetooth installation DIY

Let me post the pictures to make the story shorter.

1. You need the MFD with the BT board inside. The parts number of the 7 keys MFDs you may need are 86110-47220, 86110-47260, 86110-47200 (Japanese version),or 86110-47270 (Japanese version). The parts number of the 4 keys MFD /w BT is 86110-47210. There is no BT board in the 86110-47230 and 86110-47240.

2. 47220 (7 keys /w BT) vs 47230 (4 keys /wo BT) comparison.


3. The blue tooth board.


4. Check the wires and rewire them from the overhead console to the MFD if needed.


5. It's better to have the extra key for the phone, try to get the right side switch of the steering wheel.




6. You might need the Q7 version board of the overhead console because of the microphone amplifier.

Or, you can build the board by yourself as I did.​

7. Check the mic input level. If the gain of the amplifier is not enough, there is another setting about the voice level you can adjust.

 

Sorry for being late for the responding. I'm busy building the automatic light, fog light and DRL systems on my prius and trying to get a job recently.

Yep, this is the similar way I did. I rewired the 3 missing wires from M14 of the MFD to the plug under the dash but connected the extra ground of the mic amp that I designed to the other place of grounding due to no mentions about the grounding of the OEM amp in the repair manual.

In the repair manual, the three wires are the positive of the DC power from the MFD, plus and minus audio signals to the MFD. I didn't find the connection of the ground for the mic amp by multi-meter measurement which should act as a coil-like circuit to separate the audio signal and the ground of DC on the MFD side.

I knew other guys directly grounded the minus signal wire to make the OEM mic amp work. As an electronic engineer I was, I wouldn't like to do it this way because of the balanced mic amp I already built.